Investigation of optical characteristics of PbMoO4 single crystals by spectroscopic ellipsometry

Date

2022-07-01

Author

Delice, S.
Isik, M.
Hasanlı, Nızamı
Darvishov, N.H.
Bagiev, V.E.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

138
views

0
downloads

© 2022 Elsevier GmbHIn this study, we investigated the optical properties of PbMoO4 single crystals grown by Czochralski method. Spectroscopic ellipsometry measurements were carried out in the energy region between 1.0 and 5.5 eV at room temperature. X-ray diffraction measurements were achieved for structural characterization. The resulted pattern exhibited one peak belonging to (200) plane. Spectral variations of complex dielectric function, complex refractive index, absorption coefficient and dissipation function were obtained from the analyses of ellipsometry data. Real part of dielectric function increased up to 4.0 eV and then decreased suddenly at above this value. Zero frequency refractive index and dielectric constant were found to be 2.04 and 4.15, respectively. High frequency dielectric constant was determined to be 4.36. Optical band gap of PbMoO4 crystals was calculated as 3.09 eV. Two critical points with energies of 3.57 and 4.34 eV were estimated from the analyses of second-energy derivative spectra of real and imaginary parts of dielectric function. It was determined that [MoO4]2− complexes and charge transfer from Pb2+ ions into the neighboring Mo groups were responsible for these interband transitions. Dissipation function increased with increasing photon energy.

Subject Keywords

Ellipsometry, Lead molybdate, Optical parameters

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85131124853&origin=inward
https://hdl.handle.net/11511/97625

Journal

Optik

DOI

https://doi.org/10.1016/j.ijleo.2022.169356

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Investigation of linear and nonlinear optical properties of PbWO4 single crystal Delice, S.; Isik, M.; Hasanlı, Nızamı (2022-11-01) © 2022 Elsevier B.V.In this manuscript, PbWO4 single crystals having great importance for device applications were studied in terms of linear and nonlinear optical properties. For this purpose, transmission and reflection experiments were performed in the wavelength range of 350–1000 nm. X-ray diffraction analysis presented crystalline structure as scheelite type tetragonal. Spectral dependencies of absorption coefficient, skin depth, refractive index, dielectric function were reported. Optical band gap of ...
Optical characterization of Ga2SeS layered crystals by transmission, reflection and ellipsometry IŞIK, MEHMET; Hasanlı, Nızamı (2015-07-10) Optical properties of Ga2SeS crystals grown by Bridgman method were investigated by transmission, reflection and ellipsometry measurements. Analysis of the transmission and reflection measurements performed in the wavelength range of 400-1100 nm at room temperature indicated the presence of indirect and direct transitions with 2.28 eV and 2.38 eV band gap energies. Ellipsometry measurements were carried out in the 1.2-6.0 eV spectral region to get information about optical constants, real and imaginary part...
Growth and characterization of PbMo0.75W0.25O4 single crystal: A promising material for optical applications Isik, M.; Hasanlı, Nızamı; Darvishov, N.H.; Bagiev, V.E. (2023-02-15) The present paper reports the structural and optical properties of PbMo0.75W0.25O4 single crystals grown by Czochralski method. XRD pattern of the crystal indicated well-defined two diffraction peaks associated with tetragonal crystalline structure. Raman and infrared spectra of the grown single crystals were presented to get information about the vibrational characteristics. Observed Raman modes were associated with modes of PbMoO4 and PbWO4. Eight bands were revealed in the infrared spectrum. The bands ob...
Optical characterization of CuIn5S8 crystals by ellipsometry measurements IŞIK, MEHMET; Gasanly, Nizami (2016-04-01) Optical properties of CuIn5S8 crystals grown by Bridgman method were investigated by ellipsometry measurements. Spectral dependence of optical parameters; real and imaginary parts of the pseudodielectric function, pseudorefractive index, pseudoextinction coefficient, reflectivity and absorption coefficients were obtained from the analysis of ellipsometry experiments performed in the 1.2-6.2 eV spectral region. Analysis of spectral dependence of the absorption coefficient revealed the existence of direct ban...
Investigation of the effect of design parameters on vapor chamber heat transfer characteristic Karakaya, İrem; Bayer, Özgür; Dursunkaya, Zafer; Department of Mechanical Engineering (2022-11-25) In this study, a detailed two-phase computational modeling of a vapor chamber is performed. A code written in MATLAB is used to accurately simulate the phase-change process within the wick structure. Conservation of mass is satisfied by matching the evaporated and condensed fluid mass flow rates. Secant Method is used to find vapor temperature. The current model is validated and then, wall temperature, pressure, and mass flow rate distributions of the working fluid are calculated and plotted. Parametric stu...

Citation Formats

S. Delice, M. Isik, N. Hasanlı, N. H. Darvishov, and V. E. Bagiev, “Investigation of optical characteristics of PbMoO4 single crystals by spectroscopic ellipsometry,” Optik, vol. 262, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85131124853&origin=inward.